Heavy Duty Mounted Magnetizing and Demagnetizing Solenoid Subcategory_Brushes sized to protect a pair

sized to protect a pair of 50mm (2-inch) bar magnets between lessons and isolate them from steel benchtops

sized for general-purpose coil winding and electromagnet construction at the workhorse gauge of the line

Pairs 50mm of aperture with a 200mm focal length on a convex glass surface

Hand-cranked friction-wheel drive sandwiched between clear acrylic plates

providing a quick swap-in reference for general-purpose AC-circuit and timing-experiment work

Heavy Duty Mounted Magnetizing and Demagnetizing Solenoid Subcategory_Brushes sized to protect a pairLarger 250 x 46mm solenoid drawing 12V at 6A, the wider bore accepting full size bar magnets while AC current drives the alternating field that rotates domains for demagnetization.